JEE Main 2021 Question Paper (31-Aug-2021) (Shift 2)

Question 1

The incorrect expression among the following is :

Accepted Answer

$ \ln K = \frac{\Delta H^\circ - T \Delta S^\circ}{RT} $

Answer

For isothermal process, $ w_{	ext{reversible}} = -nRT \ln \frac{V_f}{V_i} $

Answer

$ \frac{\Delta G_{	ext{System}}}{\Delta S_{	ext{Total}}} = -T \quad 	ext{(at constant } P 	ext{)} $

Answer

$ \mathrm{K} = e^{-\Delta G^\circ / RT} $

Question 2

Match List - I with List - II:  List - I (Parameter) List - II (Unit)(a)Cell constant(iii)$\mathrm{S}\quad \mathrm{cm}^2 \quad \mathrm{mol}^{-1}$(b)Molar conductivity(i)Dimensionless(c)Conductivity(iv)m-1(d)Degree of dissociation of electrolyte(ii)$\mathrm{\Omega}^{-1} \quad \mathrm{m}^{-1}$

Accepted Answer

(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)

Answer

(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)

Answer

(a) - (iii), (b) - (iv), (c) - (i), (d) - (ii)

Answer

(a)-(ii), (b)-(i), (c)-(iii), (d)-(iv)

Question 3

The $\mathrm{Eu}^{2+}$ ion is a strong reducing agent in spite of its ground state electronic configuration (outermost): [Atomic number of $\mathrm{Eu} = 63$]

Accepted Answer

$4\mathrm{f}^{7}$

Answer

$4\mathrm{f}^6 6\mathrm{s}^2$

Answer

$4\mathrm{f}^{7}6\mathrm{s}^{2}$

Answer

$4\mathrm{f}^{6}$

Question 4

The major product of the following reaction is :

Accepted Answer

""

Answer

Answer

Answer

Question 5

Spin only magnetic moment in $\mathrm{BM}$ of $\left[\mathrm{Fe}\left(\mathrm{CO}\right)_{4}\left(\mathrm{C}_{2}\mathrm{O}_{4}\right)\right]^{+}$ is :

Accepted Answer

$1.73$

Answer

$5.92$

Answer

$1$

Answer

$0$

	List - I (Parameter)		List - II (Unit)
(a)	Cell constant	(iii)	$\mathrm{S}\quad \mathrm{cm}^2 \quad \mathrm{mol}^{-1}$
(b)	Molar conductivity	(i)	Dimensionless
(c)	Conductivity	(iv)	m^-1
(d)	Degree of dissociation of electrolyte	(ii)	$\mathrm{\Omega}^{-1} \quad \mathrm{m}^{-1}$